Alert archive / Wyoming / Special Weather Statements in 2009

Special Weather Statement, NWS Riverton, WY

August 8, 2009

NWS Riverton, WY issued this special weather statement at Aug 8, 2009, 3:01 AM MDT. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 8, 2009, 3:01 AM MDT (09:01 UTC)
Expired
Aug 8, 2009, 3:45 AM MDT
In force
44 min
Issued by
NWS Riverton, WY

The radar

The Riverton/Lander radar (KRIW), 86 km from the middle of the area, began a volume at 09:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 9.0 hours before the alert went out and 80 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Riverton, WY at 00:00Z on 2009-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 00:00Z on 2009-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
4120 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Aug 8, 2:53 AM MDT, 8 minutes earlier.

Area forecast discussion, Aug 8, 2:53 AM MDT, 8 minutes before
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Hazardous weather outlook, Aug 7, 6:52 PM MDT, 8 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
652 PM MDT FRI AUG 7 2009

WYZ001>020-022>030-081200-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST-
BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS-
EAST SWEETWATER COUNTY-FLAMING GORGE-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN-
NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS-
ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES-
SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN-
SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY-
TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN-
WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
652 PM MDT FRI AUG 7 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS WESTERN AND
CENTRAL WYOMING THIS EVENING AND OVERNIGHT. SOME THUNDERSTORMS MAY BE
STRONG IN NORTHERN WYOMING...WITH GUSTY WIND TO 45 MPH...SMALL HAIL
AND BRIEF HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

AN UNSTABLE AIRMASS OVER THE REGION SATURDAY WILL ALLOW FOR A
CONTINUED CHANCE OF SHOWERS AND THUNDERSTORMS. COOLER AND DRIER AIR
WILL FOLLOW SUNDAY. SNOW IS ALSO EXPECTED OVER THE NORTHWEST
MOUNTAINS FRIDAY NIGHT AND SATURDAY WITH THE SNOW LEVEL BETWEEN 8500
AND 9500 FEET. SEVERAL INCHES OF SNOW IS EXPECTED ABOVE 9000 TO 10000
FEET.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ASKED TO REPORT HAIL AND WIND GUSTS IN EXCESS OF 40 MPH
FROM THUNDERSTORMS. THANK YOU.

TEAM RIVERTON

In the hours before

Special weather statement, Aug 8, 1:02 AM MDT, 1 hour 59 minutes before
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Special weather statement, Aug 8, 1:37 AM MDT, 1 hour 24 minutes before
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Special weather statement, Aug 8, 2:02 AM MDT, 59 minutes before
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Special weather statement, Aug 8, 2:06 AM MDT, 55 minutes before
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Local storm report, Aug 8, 2:34 AM MDT, 27 minutes before
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Special weather statement, Aug 8, 3:01 AM MDT, 0 minutes before
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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 7, 10:09 PM MDTSpecial Weather StatementRIWJohnson36 min
Aug 7, 10:17 PM MDTSevere Thunderstorm WarningRIWJohnson58 min
Aug 7, 10:28 PM MDTTornado WarningRIWJohnson49 min
Aug 7, 11:01 PM MDTSevere Thunderstorm WarningRIWJohnson44 min
Aug 7, 11:40 PM MDTSpecial Weather StatementRIWNatrona65 min
Aug 7, 11:45 PM MDTSpecial Weather StatementRIWJohnson45 min
Aug 8, 12:39 AM MDTSpecial Weather StatementRIWJohnson51 min
Aug 8, 1:18 AM MDTSevere Thunderstorm WarningRIWJohnson42 min
Aug 8, 2:06 AM MDTSpecial Weather StatementRIW39 min
Aug 8, 2:18 AM MDTSevere Thunderstorm WarningRIWNatrona42 min
Aug 8, 2:24 AM MDTSevere Thunderstorm WarningRIWFremont37 min
Aug 8, 2:34 AM MDTSevere Thunderstorm WarningRIWNatrona26 min
Aug 8, 3:08 AM MDTSpecial Weather StatementRIWWashakie52 min
Aug 8, 4:09 AM MDTSpecial Weather StatementRIWNatrona66 min
Aug 8, 5:05 AM MDTSpecial Weather StatementRIW40 min
Aug 8, 11:52 AM MDTSpecial Weather StatementRIW53 min
Aug 8, 12:09 PM MDTSpecial Weather StatementRIWWashakie51 min
Aug 8, 12:53 PM MDTSpecial Weather StatementRIWWashakie37 min
Aug 8, 1:40 PM MDTSpecial Weather StatementRIWJohnson50 min
Aug 8, 1:59 PM MDTSpecial Weather StatementRIWNatrona46 min
Aug 8, 2:31 PM MDTSpecial Weather StatementRIWBig Horn44 min
Aug 8, 2:38 PM MDTSpecial Weather StatementRIWNatrona52 min
Aug 8, 2:46 PM MDTSpecial Weather StatementRIWJohnson44 min
Aug 8, 2:49 PM MDTSpecial Weather StatementRIWBig Horn41 min
Aug 8, 3:01 PM MDTSpecial Weather StatementRIWBig Horn44 min
Aug 8, 3:24 PM MDTSpecial Weather StatementRIWFremont51 min
Aug 8, 3:37 PM MDTSpecial Weather StatementRIWNatrona38 min
Aug 8, 4:49 PM MDTSpecial Weather StatementRIWHot Springs26 min

Nearby

Special Weather Statements in Wyoming, 2009Every special weather statement in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.